Article
Polymer Science
Konstantin A. Milakin, Zuzana Moravkova, Udit Acharya, Martina Kasparova, Stefan Breitenbach, Oumayma Taboubi, Jiri Hodan, Jirina Hromadkova, Christoph Unterweger, Petr Humpolicek, Patrycja Bober
Summary: Polyaniline-based cryogels prepared by oxidative cryopolymerization with poly(N-vinylpyrrolidone) and phytic acid showed improved mechanical strength and stability, but changes in conductivity and specific surface area were observed. Optimal concentration of phytic acid enhanced material conductivity and surface area, while improving tensile modulus and cytocompatibility of the cryogels.
Article
Engineering, Manufacturing
Venkatakrishnan Rengarajan, Angela Clyde, Jefferson Pontsler, Jonathan Valiente, Adreann Peel, Yu Huang
Summary: This study evaluated the cytotoxicity of leachable toxins introduced into final products during the 3D printing process and reduced their toxicity through three treatment methods. The results showed that all 3D-printed materials were toxic to cells in a leachable manner, with flexible materials being more toxic than rigid materials. The Soxhlet solvent extraction method was the most effective in removing the leachable toxins and eliminating the material's toxicity.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Biochemistry & Molecular Biology
Liying Zhang, Gao He, Yang Yu, Yu Zhang, Xiang Li, Shige Wang
Summary: In this study, a multifunctional hydrogel with photothermal conversion capability, biocompatibility, and degradation ability was successfully prepared. Additionally, the hydrogel has the potential to induce osteogenesis and showed good biocompatibility and photothermal conversion properties in both cell and animal experiments.
Article
Thermodynamics
Giovanna Ferrentino, Nabil Haman, Ksenia Morozova, Giustino Tonon, Matteo Scampicchio
Summary: The study aimed to extract antimicrobial compounds from Picea abies residues using two different extraction technologies and tested their activity on microbial growth. Results showed similar antimicrobial activity in both extracts, with identified phenolic compounds responsible for the effect. The study provided insights into the potential of natural antimicrobial alternatives from sustainable sources.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
D. Switha, S. Khaleel Basha, V. Sugantha Kumari
Summary: The study optimized a conductive PANI-PVA-NS biocomposite by adding different concentrations of nanostarch and investigated its properties using various techniques such as FTIR, XRD, SEM, and TEM. The results showed promising potential for application in tissue engineering.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Food Science & Technology
Joao Goncalo Lourenco, Daniel Ettlin, Ines Carrero Cardoso, Jesus M. Rodilla
Summary: A new closed-vessel microwave-assisted extraction (MAE) method was designed for the quantitation of total fat in olive samples, showing better performance indicators, improved productivity, and simplified sample handling. The MAE method also eliminates the need for calibration in the sample matrix when compared to NIR-based methods.
Article
Chemistry, Multidisciplinary
Sakonwat Kuepethkaew, Sappasith Klomklao, Yi Zhang, Benjamin K. Simpson
Summary: The partitioning and recovery of proteases from stomach extract (SE) and acidified stomach extract (ASE) of lizardfish using a three-phase partitioning (TPP) system combined with an aqueous two-phase system (ATPS) was optimized. The highest yield and purity were achieved in the interphase of the TPP system, with a SE or ASE to t-butanol ratio of 1.0 : 0.5 and 40% (w/w) (NH4)(2)SO4. ATPS conditions including PEG molecular mass and concentrations, as well as types and concentrations of salts, influenced protein partitioning. The combination of TPP, ATPS, and back extraction (BE) proved effective in recovering and purifying proteases from the stomach of lizardfish.
Article
Chemistry, Physical
Pawel Kazimierski, Paulina Kosmela, Piotr Piersa, Szymon Szufa
Summary: A fundamental issue in waste management and the rail transport industry is the utilization of used railroad ties, which are considered hazardous waste due to the high toxicity of the preservative used on them. This issue can be addressed by employing the pyrolysis and torrefaction process, which has been proven effective for disposing of this type of waste. The process involves subjecting the waste to thermal treatment at temperatures up to 400 ? to completely neutralize the waste and obtain solid products free from creosote.
Article
Chemistry, Multidisciplinary
Xana Alvarez, Angeles Cancela, Yolanda Merchan, Angel Sanchez
Summary: A study was conducted on the leaves of six Eucalyptus species using different extraction methods and investigating the impact of solvent polarity on extraction yields. The results demonstrated the significant potential of E. nitens in terms of compound content, with substantially higher yields compared to other species.
APPLIED SCIENCES-BASEL
(2021)
Article
Food Science & Technology
Umut Kargili, Ezgi Aytac
Summary: The objective of this study was to investigate the cannabinoid content of cannabis plant extracts using Soxhlet extraction. The results showed that different strains and regions had significant effects on the yield of CBD and THC.
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Meryem Hajji Nabih, Hamza Boulika, Maryam El Hajam, Mohammed I. Alghonaim, Noureddine Idrissi Kandri, Sulaiman A. Alsalamah, Fehmi Boufahja
Summary: The valorization of vegetable wastes has gained significant interest due to their unique chemical composition that contains important substances, such as antioxidants. In this study, three solvents of different polarities were used to extract phenolic compounds from Cynara cardunculus L. waste using two extraction methods. The extracts were characterized and evaluated for their antioxidant properties. The results showed that the leaves and stems of the studied cardoon waste were rich sources of natural antioxidants.
Article
Chemistry, Multidisciplinary
Rashi Srivastava, Jose Parambil
Summary: Phytochemical compounds in plants have protective and preventive effects, making them promising in various industries. Aegle marmelos has been studied for its bioactive compounds that can potentially reduce the risk of diseases. Different extraction methods, conventional and non-conventional, have been reported for extracting phytoconstituents from A. marmelos, with microwave- and ultrasonic-assisted techniques being faster and more efficient. The choice of solvent, extraction duration, and temperature are important process parameters for the scaleup of extracting valuable phytochemicals from A. marmelos.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Mohammad Hadi Salehi, Hooman Golbaten-Mofrad, Seyed Hassan Jafari, Vahabodin Goodarzi, Maliheh Entezari, Mehrdad Hashemi, Soheila Zamanlui
Summary: Bacterial cellulose aerogel was successfully used as a matrix for embedding nanomaterials and polymers to form conductive composite materials. The inclusion of nano-clay and polyaniline in the aerogel led to a significant improvement in electrical conductivity and thermal stability.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Maria Anna Charitopoulou, Lambrini Papadopoulou, Dimitris S. Achilias
Summary: This study investigated the possibility of extracting bromine from waste electric and electronic equipment (WEEE) using solvent extraction as a pretreatment method to reduce its toxicity before thermochemical recycling. The results showed that the bromine content was significantly reduced after multiple extractions using isopropanol, ethanol, and butanol solvents. The use of butanol completely eliminated bromine, enabling the recycling of pure plastics.
Article
Acoustics
Yong-jing Liu, Li Lou, Qun Huang, Wei Xu, Hua Li
Summary: In this study, a simple, efficient and green technique of preparing scutellarin from Erigerontis Herba was proposed, combining ultrasonic assisted-DES extraction with anti-solvent purification. Different types of DES were prepared and studied for their abilities to extract scutellarin, and DES composed of choline chloride and acetamide with 30% water obtained the highest extraction yield. Anti-solvent was proved as an efficient method to recover scutellarin from the DES extract. Microscopic structural analysis was carried out to investigate the extract process and explain the extraction principle. The antioxidative activities of the DES extracts were also evaluated, indicating that the bioactive property of scutellarin remained. This study provides an effective alternative strategy to extract bioactive compounds from TCM.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Materials Science, Biomaterials
Kadir Ozaltin, Elif Vargun, Antonio Di Martino, Zdenka Capakova, Marian Lehocky, Petr Humpolicek, Natalia Kazantseva, Petr Saha
Summary: Plasma treatment is used to increase the hydrophilicity of porous polylactic acid and facilitate the immobilization of fucoidan for medicated wound dressings.
INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS
(2022)
Article
Polymer Science
Lenka Musilova, Eva Achbergerova, Lenka Vitkova, Roman Kolarik, Martina Martinkova, Antonin Minarik, Ales Mracek, Petr Humpolicek, Jiri Pecha
Summary: In this study, a novel cytocompatible material suitable for extrusion-based 3D printing was designed. Hydrogels were prepared by cross-linking gelatins with dextran polyaldehyde, exhibiting desirable rheological behavior and cell-friendly environment. The hydrogels showed strong shear-thinning behavior, quick gelation, and formed self-supported porous structures. Additionally, the hydrogels were non-cytotoxic and allowed homogeneous cell distribution within the printed scaffolds.
Article
Biochemistry & Molecular Biology
Marketa Kadleckova, Katerina Skopalova, Barbora Ptoskova, Erik Wrzecionko, Eliska Dadova, Karolina Kocourkova, Ales Mracek, Lenka Musilova, Petr Smolka, Petr Humpolicek, Antonin Minarik
Summary: The pseudo 3D hierarchical structure mimicking in vivo microenvironment was prepared using phase separation method. It was found that the structured surface had a significant impact on cell proliferation and morphology, with the most remarkable effect observed on embryonic stem cells.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Asma Abdulkareem, Aya E. Abusrafa, Sifani Zavahir, Salma Habib, Patrik Sobolciak, Marian Lehocky, Hana Pistekova, Petr Humpolicek, Anton Popelka
Summary: Hydrophobic fibrous slippery liquid-infused porous surfaces (SLIPS) can prevent biofilm formation and exhibit antibacterial activity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Daniela Jasenska, Vera Kasparkova, Ondrej Vasicek, Lukas Munster, Antonin Minarik, Simona Kacerova, Eva Korabkova, Lucie Urbankova, Jan Vicha, Zdenka Capakova, Ermelinda Falleta, Cristina Della Pina, Marian Lehocky, Katerina Skopalova, Petr Humpolicek
Summary: In this study, a green and nature-friendly synthesis method was successfully employed to prepare polyaniline colloidal particles using horseradish peroxidase and chitosan or poly(vinyl alcohol) as stabilizers. The particles showed antioxidation activity and were able to reduce oxidative stress and inhibit the production of inflammatory cytokines. They also exhibited immunomodulatory effects and cell-instructive properties.
Article
Materials Science, Multidisciplinary
Martina Polaskova, Tomas Sedlacek, Vera Kasparkova, Petr Filip
Summary: Polyvinyl chloride (PVC) is a widely used material in medical device production and its flexibility is achieved by adding plasticizer. However, plasticizers can easily migrate from PVC to surrounding media, causing toxic effects. This study shows that embedding plasticized PVC into another polymer layer can significantly reduce the migration of plasticizers.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Martina Martinkova, Berenika Hausnerova, Jakub Huba, Tomas Martinek, Simona Kacerova, Vera Kasparkova, Petr Humpolicek
Summary: Alumina-based scaffolds prepared by powder injection molding can be used for bone graft preparation. The final architecture of the scaffolds can be controlled by the size and volume ratio of the powder space holder. The cell-instructive property of alumina can be enhanced by coating it with electrically-conducting polyaniline or polyaniline/biopolymer films. The cytocompatibility of the functionalized scaffolds was confirmed, showing their potential application.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jaroslav Stejskal, Marek Jurca, Jarmila Vilcakova, Miroslava Trchova, Zdenka Kolska, Jan Prokes
Summary: In this study, macroporous melamine/formaldehyde sponge was coated in situ during the oxidation of pyrrole with iron(III) chloride hexahydrate. It was found that the addition of silicotungstic acid resulted in the formation of polypyrrole/silicotungstate deposits in either globular or nanotube form. These hybrid composites combined an organic conducting polymer with an inorganic component and had a large specific surface area. Furthermore, carbonization of the sponges resulted in the formation of macroporous carbon electrodes.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
Monika Vostinakova, Simona Lupinkova, Petr Rysanek, Jaroslav Stejskal, Zdenka Kolska
Summary: A novel composite material, polyaniline/aramid, was synthesized for the purpose of capturing carbon dioxide. The polyaniline was prepared via oxidative polymerization of aniline and used to modify the aramid surface. The composite showed a significantly increased carbon dioxide capture capacity compared to pristine aramid. This new material has the potential to be used as an effective adsorbent for carbon dioxide and for applications based on its adsorption properties.
POLYMER INTERNATIONAL
(2023)
Article
Chemistry, Applied
Fahanwi Asabuwa Ngwabebhoh, Tomas Saha, Jaroslav Stejskal, Miroslava Trchova, Dusan Kopecky, Jiri Pfleger
Summary: Conducting polymers, particularly polypyrrole, were used for surface modification of three different leathers. The polymer was deposited on collagen fibers, forming a thin layer with thickness ranging from 24 to 200 μm. The modified leathers showed changes in mechanical properties and sheet resistances, and their conductivity and electroactivity can potentially be utilized in intelligent leathers for footwear, heating elements, and energy storage.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Analytical
Fahanwi Asabuwa Ngwabebhoh, Tomas Saha, Jaroslav Stejskal, Jan Prokes, Zdenka Kolska, Miroslava Trchova
Summary: Pigskin leather was carbonized to produce conducting nitrogen-containing carbons at temperatures up to 1200 degrees C. The yield of the solid char was high, even at high temperatures. The original morphology of collagen fibres was preserved and changes in molecular structure were observed. The electrical properties of the carbonized leather waste were found to be comparable to conducting polymers.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Materials Science, Multidisciplinary
Jaroslav Stejskal, Fahanwi Asabuwa Ngwabebhoh, Tomas Saha, Jan Prokes
Summary: In this study, leather waste carbonized at 800 ?C in an inert atmosphere was coated in situ with polyaniline. The resulting composites exhibited a bicontinuous conducting morphology due to the fibrous collagen structure of the original leather. The composites showed good conductivity even under alkaline conditions and were demonstrated to be potential adsorbents for organic-dye pollutants in water treatment, controllable by applied electrical potential.
Article
Chemistry, Multidisciplinary
Barbora Grycova, Katerina Klemencova, Pavel Lestinsky, Jaroslav Stejskal, Tomas Saha, Miroslava Trchova, Jan Prokes
Summary: The study investigates the conductivity of chromium-tanned pigskin leather waste carbonized using various methods to produce nitrogen-containing carbons. Four protocols were tested, and the most effective method involved pre-carbonization followed by activation. It was found that the carbonized material maintained its fibrous collagen morphology, with a slight reduction in yield. The activated products showed improved specific surface area, pore volume, and conductivity. The resistivity of the carbonized leather was determined, and the sample conductivity was relatively unaffected by the carbonization method.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Engineering, Biomedical
L. Vitkova, N. Kazantseva, L. Musilova, P. Smolka, K. Valaskova, K. Kocourkova, M. Humenik, A. Minarik, P. Humpolicek, A. Mracek, I. Smolkova
Summary: In this study, a magneto-responsive hydrogel based on hyaluronan was fabricated, which exhibited good mechanical properties and thermosensitivity. It was found that the hydrogel could rapidly heat under exposure to low amplitude radio frequency alternating magnetic field. In addition, the hydrogel showed cytocompatibility and 3D printability, making it suitable for biomedical applications.
APL BIOENGINEERING
(2023)
